Alim is the first

Iran Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...

ian

passive radar Passive radar systems (also referred to as passive coherent location, passive surveillance systems, and passive covert radar) encompass a class of radar systems that detect and track objects by processing reflections from non-cooperative sources of ...

. Passive radars do not transmit. Instead, they detect and track objects by processing reflections from non-cooperative sources of illumination in the environment, such as commercial broadcast and communications signals. Alim is cheaper and has lower maintenance cost than conventional radars because it lacks a transmitter and movable mechanical parts. It requires high processing power, as six levels of processing are needed to track targets. Other advantages include the ability to detect low

RCS RCS may refer to: Organisations *Racing Club de Strasbourg Alsace * Radio Corporation of Singapore *Radcliffe Choral Society * Rawmarsh Community School *Red Crescent Society *Red Cross Society * Representation of Czechs and Slovaks, a football t ...

targets at low altitudes. Since it doesn't transmit, it is immune to anti radiation missiles such as American

AGM-88 HARM The AGM-88 HARM (High-speed Anti-Radiation Missile) is a tactical, air-to-surface anti-radiation missile designed to home in on electronic transmissions coming from surface-to-air radar systems. It was originally developed by Texas Instruments as ...

, thus it can be deployed near enemy lines. It was first seen in 2011 during the parade of

Iranian armed forces The Islamic Republic of Iran Armed Forces, are the combined military forces of Iran, comprising the Islamic Republic of Iran Army (''Arteš''), the Islamic Revolutionary Guard Corps (''Sepâh'') and the Law Enforcement Force (Police). Iran ...

. The radar has a range of between 250 and 300 km and is able to detect slow, low flying targets with relative ease.Mashreghnews-A look at 10 unknown Iranian radars
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{{Iran Military Ground radars Passive radars Post–Cold War military equipment of Iran Military radars of Iran Military equipment introduced in the 2010s

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